EP 2340424 B1 20190327 - A TEST METHOD AND TOOL FOR TESTING A SCREW FASTENER
Title (en)
A TEST METHOD AND TOOL FOR TESTING A SCREW FASTENER
Title (de)
TESTVERFAHREN UND WERKZEUG ZUM TESTEN EINES KRAFTSCHRAUBERS
Title (fr)
PROCÉDÉ ET OUTIL POUR LE TEST D'UN OUTIL DE VISSAGE
Publication
Application
Priority
- SE 2009000470 W 20091022
- SE 0802247 A 20081022
- SE 0802379 A 20081112
Abstract (en)
[origin: WO2010047638A1] A screw fastener testing method for verifying the status of a previously tightened screw fastener as regards installed torque (T) and actual torque growth per angle of rotation (dT/dF) properties including the following steps applying an increasing tightening torque on the fastener, measuring the torque magnitude (T) at the start of rotation of the fastener, measuring the rotational movement (F) of the fastener after said start of rotation, calculating the torque growth per angle of rotation (dT/dF) for a certain predetermined test interval of rotation (?F) from said start of rotation, comparing the torque magnitude (T) indicated during rotation and the calculated torque growth per angle of rotation (dT/dF) during said test interval (?F) of rotation with predetermined reference values (Tstart, KR) or (TE, KP), respectively, characteristic for the actual fastener when tightened to a desired target torque level, and approving or disapproving the fastener status in view of said reference values.
IPC 8 full level
G01L 5/24 (2006.01); B25B 23/14 (2006.01); G01L 25/00 (2006.01)
CPC (source: EP US)
G01L 5/24 (2013.01 - EP US); G01L 25/003 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
WO 2010047638 A1 20100429; CN 102187190 A 20110914; CN 102187190 B 20130410; EP 2340424 A1 20110706; EP 2340424 A4 20150304; EP 2340424 B1 20190327; JP 2012506324 A 20120315; JP 5645193 B2 20141224; US 2011247434 A1 20111013; US 8578793 B2 20131112
DOCDB simple family (application)
SE 2009000470 W 20091022; CN 200980141742 A 20091022; EP 09822264 A 20091022; JP 2011533137 A 20091022; US 200913125117 A 20091022